It's a process that will be repeated all across the country, and in every government agency. Plus, whenever funding is restored, it will cost money to get the project back up to speed.

In the meantime, costs will increase the longer a shutdown drags on.

"The longer a shutdown is in place, the more extensive the costs become," said John F. Cooney, a partner at law firm Venable who designed shutdown plans for the government while employed at the Office of Management and Budget.

When the clock strikes midnight and a shutdown starts, paychecks for federal workers stop. But that won't be saving taxpayers any money.

When a shutdown ends after Congress passes a spending bill, the "essential" workers who were kept on the job will automatically be paid for the time they worked during the shutdown.

And the 800,000 or so workers who might be furloughed? In every previous government shutdown, Congress has authorized back pay for them as well, even for days they didn't work. One caveat: There is no guarantee that will happen again.

But if it does, it'll be a double whammy. Workers will get their paychecks, but the work they normally do will have piled up in the meantime. When workers return, agencies might have to pay overtime just to catch up on all the work that wasn't done during the shutdown.

And not only will the government end up with a bigger bill, there will be less revenue as well.

Some agencies -- like the National Park Service -- charge user fees. When they close, no fees are collected. On an average day, visitors spend $32 million at National Parks.

There are also intangible costs, especially when the productivity of federal workers is considered.

"You've been working your ass off ... and someone comes to tell you that you are non-essential?" Cutter said. "There is a huge management morale issue when everyone comes back to work."

Of course, when a shutdown is considered in the context of the larger budget negotiations, the whole process will almost certainly result in savings for taxpayers. That's because both Democrats and Republicans agree that a compromise spending bill will slash tens of billions from the federal budget.

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